globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2045
论文题名:
Muted change in Atlantic overturning circulation over some glacial-aged Heinrich events
作者: Lynch-Stieglitz J.; Schmidt M.W.; Gene Henry L.; Curry W.B.; Skinner L.C.; Mulitza S.; Zhang R.; Chang P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:2
起始页码: 144
结束页码: 150
语种: 英语
Scopus关键词: benthic foraminifera ; cooling ; heat transfer ; Heinrich event ; iceberg ; Last Glacial ; meltwater ; meridional circulation ; overturn ; oxygen isotope ; paleoceanography ; seawater ; Younger Dryas ; Atlantic Ocean ; Atlantic Ocean (North) ; Straits of Florida ; Foraminifera
英文摘要: Heinrich events-surges of icebergs into the North Atlantic Ocean-punctuated the last glacial period. The events are associated with millennial-scale cooling in the Northern Hemisphere. Fresh water from the melting icebergs is thought to have interrupted the Atlantic meridional overturning circulation, thus minimizing heat transport into the northern North Atlantic. The northward flow of warm water passes through the Florida Straits and is reflected in the distribution of seawater properties in this region. Here we investigate the northward flow through this region over the past 40,000 years using oxygen isotope measurements of benthic foraminifera from two cores on either side of the Florida Straits. These measurements allow us to estimate water density, which is related to flow through the thermal wind balance. We infer a substantial reduction of flow during Heinrich Event 1 and the Younger Dryas cooling, but little change during Heinrich Events 2 and 3, which occurred during an especially cold phase of the last glacial period. We speculate that because glacial circulation was already weakened before the onset of Heinrich Events 2 and 3, freshwater forcing had little additional effect. However, low-latitude climate perturbations were observed during all events. We therefore suggest that these perturbations may not have been directly caused by changes in heat transport associated with Atlantic overturning circulation as commonly assumed. © 2014 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106449
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30307, United States; Department of Oceanography, Texas AandM University, College Station, TX 77843, United States; Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom; MARUM-Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen D-28359, Germany; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ 08540, United States; Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States

Recommended Citation:
Lynch-Stieglitz J.,Schmidt M.W.,Gene Henry L.,et al. Muted change in Atlantic overturning circulation over some glacial-aged Heinrich events[J]. Nature Geoscience,2014-01-01,7(2)
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